Year % of GNI 1990 3.31332524446361 1991 3.10810045246669 1992 2.88699341565675 1993 2.77400709896453 1994 2.76224368815381 1995 2.43474952796712 1996 2.24291351205847 1997 2.15170361667785 1998 2.17236130223409 1999 2.06072377227405 2000 2.08483169622366 2001 1.95077132360537 2002 1.970568498168 2003 1.93280963231548 2004 1.83324395288239 2005 1.68288874222224 2006 1.73238453479658 2007 1.72351983342317 2008 1.79165304449253 2009 1.83278671727641 2010 1.81236594361682 2011 1.74205995836219 2012 1.60830595040883 2013 1.46803626175123 2014 1.41506084736885 2015 1.34555337709603 2016 1.31394057870121 2017 1.27709714502432 2018 1.22326641137643 2019 1.21329686085933 2020 1.2083702033263 2021 1.08849828144076